From 06c639db6b98affab4abf07e57a90e2fcb5402ef Mon Sep 17 00:00:00 2001
From: rcoh <rcoh@mit.edu>
Date: Sat, 5 Feb 2011 22:34:34 -0500
Subject: Early stages of param-binding in xml.  Functional.  RCOH

---
 operationscore/SmootCoreObject.py | 11 ++++++++---
 tests/TestConfigLoaders.py        |  9 ++++++++-
 util/ColorOps.py                  |  4 ++++
 util/Config.py                    | 10 ++++++++++
 util/Geo.py                       |  7 +++++++
 5 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/operationscore/SmootCoreObject.py b/operationscore/SmootCoreObject.py
index 0d32773..51b84e3 100644
--- a/operationscore/SmootCoreObject.py
+++ b/operationscore/SmootCoreObject.py
@@ -2,6 +2,7 @@ import pdb
 import threading
 import thread
 import util.Config as configGetter
+import types
 
 class SmootCoreObject(object):
     """SmootCoreObject is essentially a super-object class which grants us some niceties.  It allows
@@ -34,9 +35,13 @@ class SmootCoreObject(object):
     def __setitem__(self,k, item):
         self.argDict[k] = item
         
-    def __getitem__(self, item):
-        if item in self.argDict:
-            return self.argDict[item]
+    def __getitem__(self, key):
+        if key in self.argDict:
+            item = self.argDict[key]
+            if isinstance(item, types.FunctionType):
+                return item(self.argDict) #resolve the lambda function, if it exists
+            else:
+                return item
         else:
             return None
     def __contains__(self, item):
diff --git a/tests/TestConfigLoaders.py b/tests/TestConfigLoaders.py
index c79bbf1..c7e2b7a 100644
--- a/tests/TestConfigLoaders.py
+++ b/tests/TestConfigLoaders.py
@@ -29,6 +29,13 @@ class TestConfigLoaders(unittest.TestCase):
         result.write('tests/testdata/inheritanceTESTout.xml')
         assert filecmp.cmp('tests/testdata/inheritanceTESTout.xml',\
             'tests/testdata/inheritanceTRUTH.xml')
-
+    #Tests our fancy new XML Eval Function
+    def test_eval(self):
+        assert Config.attemptEval('5') == 5
+        assert Config.attemptEval('{5:10, 12:15}') == {5:10, 12:15}
+        singleLayerLambda = Config.attemptEval('${Val}$*5')
+        assert singleLayerLambda({'Val':2}) == 10 
+        doubleLayerLambda = Config.attemptEval("${Val1}$*'${Val2}$'")
+        assert doubleLayerLambda({'Val1':3})({'Val2':7}) == 21
 if __name__ == '__main__':
     unittest.main()
diff --git a/util/ColorOps.py b/util/ColorOps.py
index 4b1162a..796a902 100644
--- a/util/ColorOps.py
+++ b/util/ColorOps.py
@@ -40,3 +40,7 @@ def randomBrightColor():
     hue, sat, val = colorsys.hsv_to_rgb(hue, sat, val)
     ret = [hue, sat, val]
     return floatToIntColor(ret)
+
+class Color(object):
+    def __init__(self, r,g,b):
+        self.rep = [r,g,b]
diff --git a/util/Config.py b/util/Config.py
index 6fdb0d4..4153313 100644
--- a/util/Config.py
+++ b/util/Config.py
@@ -1,4 +1,5 @@
 from xml.etree.ElementTree import *
+import re
 import sys
 import xml
 import pdb
@@ -113,6 +114,15 @@ def pullArgsFromItem(parentNode):
 
 def attemptEval(val):
     try:
+        if '${' in val and '}$' in val: #TODO: this could be a little cleaner
+            dictVal = re.sub("'\$\{(.+)\}\$'", "b['\\1']", val) #replace all expressions like {blah} with a['blah']
+            dictVal = re.sub("\$\{(.+)\}\$", "a['\\1']", dictVal) #replace all expressions like {blah} with a['blah']
+            if "'${" and "}$'" in val: #nested lambda madness
+                lambdaVal = eval('lambda a: lambda b: ' + dictVal)
+            else:
+                lambdaVal = eval('lambda a:'+dictVal) #TODO: nested lambdas
+            return lambdaVal  #convert referential objects to lambda expressions which resolve
+            #dynamically
         val = eval(val)
     except (NameError, SyntaxError):
         val = str(val)
diff --git a/util/Geo.py b/util/Geo.py
index 0dde80b..43817ad 100644
--- a/util/Geo.py
+++ b/util/Geo.py
@@ -32,3 +32,10 @@ def windtrail(x,y,height,center,width):
     b=center
     c=width
     return a*((math.exp(-((x-b))/(c)))**2)*(math.exp(-((y))/(0.2*c)))**2
+
+class Location(object):
+    def __init__(self,x=0,y=0):
+        self.x = x
+        self.y = y
+    def __add__(self, b):
+        return Location(self.x+b.x, self.y+b.y)
-- 
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